Enterozoa
肠腔动物
🗣️ 情景例句
Have you ever done any work in this field?
你曾经干过这一行吗？
You need an injection.
你需要打针。
only of metal, which wears away by friction.
而是由金属组成，而金属可以随着磨擦而磨损殆尽。